Strange behavior of just one #OneToOne property after migrating to SpringBoot 3.0 and Hibernate 6.1.5 - spring

Question

After the migration, only one relationship just stopped working for me. Other similar things are working.
So, I have such a relationship. in which, if I get an account with user and billing, user is avialable, and the billing is null.
If I pull out the billing by account id, the billing is there.
//Account
#OneToOne(mappedBy = "account", cascade = CascadeType.ALL)
private User user;
#OneToOne(mappedBy = "account", cascade = CascadeType.ALL)
private Billing billing = new Billing();
//Billing
#OneToOne
#JoinColumn(name = "account_id", nullable = false)
private Account account;
//User
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "account_id")
private Account account;
To get account, such a query is executed. If you run it from the console, then the billing ID is also there.
[Hibernate]
/* <criteria> */ select
a1_0.id,
b1_0.id,
b1_0.account_id,
b1_0.created,
b1_0.last_modified,
a1_0.created,
a1_0.last_modified
from
account a1_0
left join
user u1_0
on a1_0.id=u1_0.account_id
left join
billing b1_0
on a1_0.id=b1_0.account_id
where
u1_0.id=?
What was I trying to do?
I tried to change "Naming strategy" https://thorben-janssen.com/sequence-naming-strategies-in-hibernate-6/
Created a clean database.
Nothing helped.
Who has any ideas? What could be the problem?

Answer 1

#m-deinum here
Entities:
#Entity(name = "account")
#EntityListeners(AuditingEntityListener.class)
public class Account {
#Id
#GeneratedValue
private long id;
#OneToOne(mappedBy = "account", cascade = CascadeType.ALL)
private User user;
#OneToOne(mappedBy = "account", cascade = CascadeType.ALL)
private Billing billing;
#CreatedDate
#Convert(converter = LocalDateTimeConverter.class)
#Column(name = "created", columnDefinition = "DATETIME")
private LocalDateTime created;
#LastModifiedDate
#Convert(converter = LocalDateTimeConverter.class)
#Column(name = "last_modified", columnDefinition = "DATETIME")
private LocalDateTime lastModified;
}
#EntityListeners(AuditingEntityListener.class)
#Entity(name = "user")
public class User {
#Id
#GeneratedValue
private long id;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "account_id")
private Account account;
#CreatedDate
#Convert(converter = LocalDateTimeConverter.class)
#Column(name = "created", columnDefinition = "DATETIME")
private LocalDateTime created;
#LastModifiedDate
#Convert(converter = LocalDateTimeConverter.class)
#Column(name = "last_modified", columnDefinition = "DATETIME")
private LocalDateTime lastModified;
}
#Entity(name = "billing")
#EntityListeners(AuditingEntityListener.class)
public class Billing {
#Id
#GeneratedValue
private long id;
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "account_id")
private Account account;
#CreatedDate
#Convert(converter = LocalDateTimeConverter.class)
#Column(name = "created", columnDefinition = "DATETIME")
private LocalDateTime created;
#LastModifiedDate
#Convert(converter = LocalDateTimeConverter.class)
#Column(name = "last_modified", columnDefinition = "DATETIME")
private LocalDateTime lastModified;
}
I am using Spring Data JPA Repositories. Standard accountRepository.findById(2L) or findAccountByUserId - the same result. User is there but not billing.
public interface AccountRepository extends JpaRepository<Account, Long> {
#EntityGraph(attributePaths = {"billing"})
Optional<Account> findAccountByUserId(long id);
}
Dependencies:
Only SpringBoot Dependencies and ecpecially SB version: 3.0.0. spring-boot-starter-parent and spring-boot-starter-data-jpa(there is hibernate-core:6.1.5)